Callsign BCY is CityJet
WHAT AIRLINE IS BCY?
BCY is the ICAO three-letter callsign prefix for CityJet. When a radio scanner, flight tracker or radar scope shows a flight like BCY123 or BCY45XY overhead, that's a CityJet aircraft talking to air traffic control.
Spot one yourself: open the live scope, enter your postcode, and tap any blip whose callsign starts with BCY for its type, registration, route and photo.